Android: Enforce minimum SDK version
Gradle: Force link OpenSL classes

Fixes #866
Changed SDK check per comments
local.properties requires '/'s
Merge pull request #1545 from Tom-Ski/setuppatch

local.properties requires '/'s
Added methods to build arrow and grid models
Fixed ColorPacked bug of MeshBuilder
Use TimeUtils for GWT.
toString
Added color(Color).
Merge branch 'origin/master'
toArray without allocation.
Added functions to generate temporary matrices
Fix to keep user transform
Merge pull request #1526 from Unkn0wn0ne/patch-2

iOS: Force linked OpenSL classes
Merge pull request #1547 from lordjone/models

MeshBuilder fixes and additions
Merge pull request #1524 from Unkn0wn0ne/master

Enforced minimum SDK version on Android
Add missing methods

Fixes #1551
Fix for Music (isPlaying when paused) on iOS
Merge pull request #1552 from obigu/master

Fix for Music (isPlaying when paused) on iOS
Merge branch 'master' of https://github.com/libgdx/libgdx

# By NathanSweet (4) and others
# Via Mario Zechner (3) and others
* 'master' of https://github.com/libgdx/libgdx:
  Fix for Music (isPlaying when paused) on iOS
  Add missing methods
  Added functions to generate temporary matrices Fix to keep user transform
  toArray without allocation.
  Added color(Color).
  toString
  Use TimeUtils for GWT.
  Added methods to build arrow and grid models Fixed ColorPacked bug of MeshBuilder
  local.properties requires '/'s
  Changed SDK check per comments
  Gradle: Force link OpenSL classes
  Android: Enforce minimum SDK version